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Feature Flag Rule Simulator

Edit and inspect feature flag rule simulator locally with an accessible diagram and complete export.

feature-flag-rule-simulatorLOCAL WORKSPACE

Enabling local controls…

Local planning inputs

Local processing without upload or storage.32KiB per field,1MiB complete result,one-second Worker deadline. Editing cancels work and clears old diagrams/exports. Edit text rows for keyboard positioning/reordering. No external map tiles or device location.

Diagram and data

Edit inputs and build. All previews are generated locally.

Processing model and limits

Local first-match model, strict eq/neq/in/notIn/contains/gte/lte/gt/lt/exists. No expression evaluation/regex. Rollout uses an inferred source model verified on6 live vectors:32-bit FNV-style xor/multiply over the first UTF16unit of each Unicode code point in flag key + colon + string userId, unsigned mod100. Colon/astral collisions are possible; this is not standard byte-based FNV or verified platform compatibility. Missing attributes fail except exists=false. Local data only. Each field ≤32 KiB; ≤200 records, ≤80 graph nodes/300 edges, JSON depth30/nodes10000, ≤2000 coordinates. Complete result ≤1 MiB; diagram ≤8 million pixels and16384px per side. Edit text to move/reorder items; build again. SVG is a readable model, not an externally rendered image.

ToolHubEN inspected controls ↗

How to use this tool

Edit the labeled text fields, build, inspect the diagram and data, then copy or download JSON/SVG. Text editing provides the keyboard alternative to dragging.

When not to use it

Local first-match model, strict eq/neq/in/notIn/contains/gte/lte/gt/lt/exists. No expression evaluation/regex. Rollout uses an inferred source model verified on6 live vectors:32-bit FNV-style xor/multiply over the first UTF16unit of each Unicode code point in flag key + colon + string userId, unsigned mod100. Colon/astral collisions are possible; this is not standard byte-based FNV or verified platform compatibility. Missing attributes fail except exists=false. Local data only. Each field ≤32 KiB; ≤200 records, ≤80 graph nodes/300 edges, JSON depth30/nodes10000, ≤2000 coordinates. Complete result ≤1 MiB; diagram ≤8 million pixels and16384px per side. Edit text to move/reorder items; build again. SVG is a readable model, not an externally rendered image.